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com3: vs \\.\com3:

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HyperEngineer

HyperEngineer

Programmer
May 8, 2002
190
US
If I use "com3:" for the filename in CreateFile() I get a legitimate handle. If I use "\\.\com3" for the filename in CreateFile() I get an invalid handle value. I'm using VC2008 Standard edition. I thought I could use either one of these filenames.

HyperEngineer
If it ain't broke, it probably needs improvement.
 
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Try to get error code after failed attempt to open COM3 via UNC name. May be the reason is in usufficient rights to access network shares (UNC is a name of network objects).
 
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